I opened my signed PDF on a Mac, and the signatures are not being displayed or verified. How do I fix it?

The default PDF viewer on Mac OS X is its built-in Preview application. Unfortunately, this application only supports basic PDF features and can’t display or verify digital signatures.

To view any digitally signed PDFs, you must first download a free copy of Adobe Reader.

After installing that software you will be able to open the PDF and see the signatures.

To do this, find the signed PDF on your computer. Click on this file while holding down the control key, and select “Get Info” from the menu.

Click on the small triangle to the left of the words “Open With,” and you should see a drop-down list of potential applications. Choose Adobe Reader from that drop- down. Click the “Change All” button, and when the pop-up prompts you, click “Continue.”

Documents should now open with Adobe Reader and should show you the digital signatures on your documents.